Blake was also influenced by William Godwin's _Political Justice_ and was one of English Romantics who could accept neither Christianity nor British utilitarianism...finding industrialism and its values of acquisitiveness and competition repugnant, he looked to fantasy and transcendence for clues to protect self from alienation & exploitation. ..a pastoral utopian, he lived a pretty solitary life with the exception of the period that Jim F refers to above when his circle of friends - including Godwin, Paine, Richard Price, Joseph Priestly, Mary Wollstonecraft - had a relationship with the London Corresponding Society that promulgated radical ideas influenced by the Jacobins...
Michael Hoover (who is, admittedly, a bit out his range on this matter and welcomes comments/corrections/criticism)